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Updated: Jun 8, 2026

Chromatographic Fingerprinting by Template Matching for Data Collected by Comprehensive Two-Dimensional Gas Chromatography
Published on: September 2, 2020
Factors affecting peak shape in comprehensive two-dimensional gas chromatography with non-focusing modulation
Paul Mc A Harvey1, Robert A Shellie
1Australian Centre for Research on Separation Science, University of Tasmania, Hobart, Tasmania 7001, Australia.
Systematic distortions in comprehensive two-dimensional gas chromatography (GC×GC) affect peak shape. Increasing the flow ratio in pulsed-flow modulation (PFM)-GC×GC reduces peak skewing, improving analytical accuracy.
Area of Science:
- Analytical Chemistry
- Chromatography
Background:
- Non-focusing modulators in comprehensive two-dimensional gas chromatography (GC×GC) introduce systematic distortions.
- These distortions significantly impact the observed peak shape in the second-dimension elution profiles.
Purpose of the Study:
- To systematically investigate peak shape in pulsed-flow modulation (PFM)-GC×GC.
- To understand the influence of operating conditions, specifically flow ratio, on peak distortion.
Main Methods:
- Conducted a systematic investigation of peak shape in PFM-GC×GC.
- Developed and validated a peak shape model against experimental data.
- Analyzed peak skewing under varying flow ratios.
Main Results:
- Low flow ratios in PFM-GC×GC lead to significant peak skewing.
- Increasing the flow ratio effectively reduces the magnitude of peak skewing.
- Model validation showed residuals within -1.5% to +3.0% for isothermal and temperature-programmed models.
Conclusions:
- Peak shape in PFM-GC×GC is heavily influenced by systematic distortions.
- Flow ratio is a critical parameter for controlling and minimizing peak skewing.
- The developed peak shape model accurately represents experimental observations in GC×GC analysis.
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